Avago Technologies MegaRAID Fast Path Software - Manual (Page 147)

LSI Corporation Confidential | July 2011 Page 147
MegaRAID SAS Software User Guide Chapter 4: WebBIOS Configuration Utility | Viewing and Changing Device Properties
CC Rate Use this option to select the amount of system resources dedicated to
consistency checks of virtual drives connected to the selected
controller. The default is 30 percent.
Reconstruction Rate Use this option to select the amount of system resources dedicated to
reconstruction of drives connected to the selected controller. The
default is 30 percent.
Controller BIOS Use this option to enable or disable the BIOS for the selected controller.
The default is Enabled. If the boot device is on the selected controller,
the BIOS must be enabled; otherwise, the BIOS should be disabled or it
might not be possible to use a boot device elsewhere.
NCQ Native Command Queuing (NCQ) gives an individual drive the ability to
optimize the order in which it executes the read and write commands.
The default is Enabled.
Coercion Mode Drive coercion is a tool for forcing drives of varying capacities to the
same size so they can be used in a drive group. The coercion mode
options are None, 128MB-way, and 1GB-way. The default is 1GB-way.
The number you choose depends on how much the drives from various
vendors vary in their actual size. LSI recommends that you use the 1GB
coercion mode option.
S.M.A.R.T. Polling Use this option to determine how frequently the controller polls for
drives reporting a predictive drive failure (self-monitoring analysis and
reporting technology [SMART] error). The default is 300 seconds (5
minutes).
Alarm Control Select this option to enable, disable, or silence the onboard alarm tone
generator on the controller. The default is Enabled.
Patrol Read Rate Use this option to select the rate for patrol reads for drives connected to
the selected controller. The default is 30 percent. The patrol read rate is
the percentage of system resources dedicated to running a patrol read.
Cache Flush Interval Use this option to control the interval (in seconds) at which the
contents of the onboard data cache are flushed. The default is 4
seconds.
Spinup Drive Count Use this option to control the number of drives that spin up
simultaneously. The default is 4 drives.
Spinup Delay Use this option to control the interval (in seconds) between spin up of
drives connected to this controller. The delay prevents a drain on the
system’s power supply that would occur if all drives spun up at the same
time.
The default is 12 seconds.
StopOnError Enable this option if you want the boot process to stop when the
controller BIOS encounters an error during boot-up. The default is
Enabled.
Stop CC on Error Enable this option if you want to stop a consistency check when the
controller BIOS encounters an error. The default is No.
Maintain PD Fail
History Enable this option to maintain the history of all drive failures. The
default is Enabled.
Schedule CC Indicates whether the option to schedule the date and time for a
consistency check is supported.
Table 21: Controller Information Menu Options (Continued)
Option Description